Expiring cached password

Hello,
I am trying to decide which authentication mechanism to use for hosting svn
repo. I am thinking about just using the svnserve standalone server, but I
have one question.

The documentation (ie. svn book) mentioned that credential are cached on the
client side. Will this ever expire ? or will the client only ask for
credential once then use its cache forever ? Expiring the cache after a
certain time seems to improve security (for example in the case that the
client machine is compromised, etc).

It would be nice also if the server somehow can force the cache to expire. I
don't know if that's even possible given the authentication model. But I'm
thinking that the server could change the realm automatically, once a day or
something like that.

Thanks.

RDB

-- 
Reuben D. Budiardja
Dept. Physics and Astronomy
University of Tennessee, Knoxville, TN
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